One route in Delft is based on culture, the other on commerce. We want to guide people based on the visuals of the poster, and not based on the destination (culture or commerce in this case).
That is why we have chosen for abstract visuals. In this case we can expand a route without releasing the destination of it. 
Great drawing. I communicates the idea very nice. The crowded city of Delft with some points of interest dancing in the waves of the city..
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